分支水平井稳态渗流理论及最优井长  

The time-invariant seepage theory and optimal wellbore length of multi-lateral horizontal wells

作　　者：曾晓晶[1] 同登科 

机构地区：[1]河西学院信息技术与传媒学院,甘肃张掖734000 [2]中国石油大学理学院,山东东营257061

出　　处：《石油学报》2011年第5期882-886,共5页Acta Petrolei Sinica

基　　金：中央高校基本科研业务费专项资金(09CX05004A和10CX04011A);国家自然科学基金项目(No.40974056)联合资助

摘　　要：针对油藏中分支水平井的稳态渗流问题,基于渗流力学理论,采用全三维方法,导出了油藏稳态渗流与分支水平井井筒流动的耦合模型。用改进的Su方法以及一种新方法计算了裸眼完井分支水平井井筒内的压降,分析和比较了井筒内压力和采油指数的分布情况;同时,给出了考虑经济因素的分支水平井水平段最优长度的计算方法。结果表明,分支水平井的单个分支内的流动情况和水平井近似;由于摩擦因素的影响,分支水平井的水平分支不是越长越好,而是有一个最优值。这些结论可用于实际油藏中分支水平井的设计和产能预测。In terms of the time-invariant seepage of multi-lateral horizontal wells in oil reservoirs,a coupled model of the time-invariant seepage in reservoirs and the wellbore flow in multi-lateral horizontal wells was deduced with the full 3D analytical method based on the filtration mechanic theory.The pressure drop in barefoot completion multi-lateral horizontal wellbores was calculated using the improved Su method and a new approach,and distributions of pressure and productive indices in wellbores were analyzed and compared.At the same time,a computing method with the consideration of economic factors was proposed to optimize the length of the horizontal section for multi-lateral horizontal wells.The results derived from calculations and analyses of some real cases indicated that the flowing status within an individual branch of multi-lateral horizontal wells was similar to that in horizontal wells,the length of lateral branches of multi-lateral horizontal wells is not the longer,the better,but instead,it has an optimal value due to the friction effect.These conclusions are available for designing multi-lateral horizontal wells and forecasting the productivity of this kind of wells.

关 键 词：分支水平井 稳态渗流 压降 井筒流动 耦合 

分 类 号：TE312[石油与天然气工程—油气田开发工程]